As you have noticed, I am the only person in this thread that actually listened to you and give you useful advice so far.
Next time when you have problems, don't do these things:
- don't follow very old advice (your initial post linking to a forum post from 2017). Follow 6 year old advice is always wrong.
- never listen to anyone who doesn't ask any questions but then tell you to either delete or revert to an old driver. The first question asked should be what driver version you have and can I find you a newer driver. Reverting to an older driver without first trying to find a newer driver first is always wrong.
- never listen to anyone who just randomly listed a bunch of weblinks that doesn't do anything. That youtube video (paused at 5:38), you will see that this guy doesn't even have an infrared camera in his laptop (HP wide vision hd is just a normal webcam) and he is giving a video tutorial on the subject that he knows nothing about. His video never showed that he fixed the issue because he never had an infrared camera to begin with so the warning statement "we couldn't find a compatible camera" is correct.
You can try actually uninstalling your 2 cameras in the device manager, reboot and let your computer to reinstall the 2 cameras --- hopefully triggering the computer into reinstalling the windows hello face software device. Please paused bitlocker when you tried this.
https://www.dell.com/community/XPS/Face-recognition-stopped-working/td-p/7772495
If the computer doesn't reinstall the 2 camera automatically --- then re-install the oem lenovo driver (10.13.19041.28) first and then update the driver (10.13.22000.21) from the weblink I posted afterward. It's a 2 step process that all post 2018 DCH drivers (where graphics/audio/touchpad configuration app is downloaded from the Microsoft store) have to do or else really bad things could happen as stated by Intel.
Can I Use the 'INF/Have-disk installation’ for a Windows*... (intel.com)
Notice I never told you to delete stuff or revert to old drivers or uninstall stuff until all other options have been tried.